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Problem with overhangs

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  • undefined
    MrBlom
    last edited by 4 Apr 2017, 18:23 4 Apr 2017, 18:22

    Hello i upgraded my D-bot(corexy) lastweek and have some problems with printing small overhangs
    it prints good on normal stuff but if there is overhang it gets ugly
    please help me fix this

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    • undefined
      MrBlom
      last edited by 4 Apr 2017, 18:24

      if you can not see the image go here
      https://www.dropbox.com/s/hcju7e1wz2kmynw/2017-04-04%2020.10.41.jpg?dl=0

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        DjDemonD
        last edited by 4 Apr 2017, 18:31

        Hi couple of things
        What material?
        What nozzle temperature?
        What hotend?
        What sort of part fans?

        Simon. Precision Piezo Z-Probe Technology
        www.precisionpiezo.co.uk
        PT1000 cartridge sensors NOW IN, just attach to your Duet board directly!

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          MrBlom
          last edited by 4 Apr 2017, 18:37

          Hi sorry
          PLA
          195 - 220 tried different
          e3d titan/aero
          1 radial fan blowing from the left
          see set up here
          https://www.dropbox.com/s/b0rico0keothqr1/2017-04-01%2017.12.44.jpg?dl=0
          hmm in the pic i printed the falcon from starwars with overhang with out problems
          it seams like it only is when the overhang is curved

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          • undefined
            MrBlom
            last edited by 4 Apr 2017, 19:10

            hmm must be the cooling
            i have a 24v systems then the fans is running at 24v?
            or is the fan 12v ? if so the fan might run to slow

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            • undefined
              DjDemonD
              last edited by 4 Apr 2017, 20:49 4 Apr 2017, 20:49

              Either the fan is designed for 24v,12v or 5v. If it were 12v it would be running insanely fast at 24v, a 5v fan would probably run for a few seconds at 24v before dying.

              You probably have adequate cooling, but cooling from one side is much less effective for preventing curling which causes the pattern on the cup shaped objects at the top. The filament curls away or towards the fan.

              In the image of the blue object the focus isn't clear but I'd say it looks over extruded too.

              Simon. Precision Piezo Z-Probe Technology
              www.precisionpiezo.co.uk
              PT1000 cartridge sensors NOW IN, just attach to your Duet board directly!

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              • undefined
                MrBlom
                last edited by 4 Apr 2017, 21:10

                i have a 24v fan and system
                but it not the fan
                i put a 80mm fan on the heatbed on the other side and the result was the same
                i have done 20x20 cube and it correct size and check the e-steps

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                • undefined
                  MrBlom
                  last edited by 4 Apr 2017, 21:14 4 Apr 2017, 21:13

                  hmm will try to lower the extrusion alot to see what happens

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                  • undefined
                    MrBlom
                    last edited by 4 Jul 2017, 13:35 7 Apr 2017, 13:35

                    it was bad cooling
                    the pink part is printed with excact the same gcode but with dual radila fans
                    see pic here
                    https://www.dropbox.com/s/45figvtgtf1b6sp/2017-04-07%2015.31.59.jpg?dl=0

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                    • undefined
                      T3P3Tony administrators
                      last edited by 7 Apr 2017, 20:30

                      That is comprehensively solved!

                      www.duet3d.com

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